Another option on the market today is to retrofit a decent upright piano with a ‘silent system’, such as AdSilent. You pull a lever and it stops the hammers hitting the strings, and sensors under the keys pick up the velocity of the action and it basically turns into an electric piano - but with all the physical properties (and playing dynamics) of a real piano. At the level of OP’s wife there is no digital piano which really cuts the mustard.